Related Experiment Video
Updated: Jun 10, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
Double Brillouin frequency shift through circulation of odd-order Stokes signal
Yu Gang Shee1, Mohammed Hayder Al-Mansoori, Alyani Ismail
1Wireless and Photonics Network Research Center, Faculty of Engineering, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
Abstract:
We demonstrate a simple configuration for generating a double Brillouin frequency shift through the circulation of an odd-order Brillouin Stokes signal. It is operated based on cascaded Brillouin scattering in single-mode optical fibers that behave as the Brillouin gain media. A four-port circulator is incorporated into the setup to circulate the odd-order Brillouin Stokes signal in the fiber. It thus initiates a higher order Brillouin Stokes signal, which is double Brillouin frequency downshifted from the input signal. For the 5 km long fiber, the Brillouin pump power at 23 mW gives a clean output spectrum with 30 dB sideband suppression ratio. The output signal is 0.174 nm or approximately 21.7 GHz downshifted from the input signal.
Related Concept Videos
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Even and Odd Signals
Properties of Fourier series II
A function f(t) is...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
Doppler Effect - II
¹H NMR Signal Multiplicity: Splitting Patterns
